Perhaps you should try some spelling variations:
chiet tach » chieu sach
trinh quan » tinh quang, trinh han
hoc chiet » hoc thiet, hoc nhiet, hoc hien
tong cong » trong cong, cong cong, dung cong
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai
luat » luan, xuat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - hanh ((trinh luat) or (trinh quan)) tong cong ((van toan) OR (van tan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh ((trinh luat) OR (trinh quan)) tong cong ((van toan) OR (van tan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh ((trinh luat) or (trinh quan)) tong cong ((van toan) OR (van tan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh ((trinh luat) or (trinh quan)) tong cong ((van toan) OR (van tan)) tap*.